Schmidt DW-D Operation Manual

Schmidt Mess- und Regeltechnik
Operation Manual Flow Transmitter DW-D
1.

MOUNTING

1.1

Position of mounting

It is advantageous to install the unit in a straight piece of pipe and to choose a place of
mounting which has the biggest possible distance from elbows, valves etc.
It is especially important to have the biggest possible distance from magnet valves and ball
valves. Please make sure that they are opened as slow as possible, especially if the pipe after
the valve is empty. These measures prevent the measuring system from flow shocks which
can cause damages. We recommend a straight length of 10  d at input side and 5  d at the
output side (d= diameter of pipe).
The apparatus provides a stable signal when installed at closer distances, but depending on
flow conditions it may be less accurate
1.2

Mounting position on electronic view

Please take in consideration that the mounting has to be done EMI conform in order to avoid
interruptions of operations.
Especially the following points have to be attended:
- The provided ferrites have to be mounted as described.
- Signal and supply cable of the DW-D may not directly taken close to 230V or 380V wirings.
- The device should not be installed close to inductance, switching loads, engines or similar
sources of inductive fields.
1.3

Direction of Flow

It is essential that the unit is mounted so that flow is as indicated by the arrow on the body.
The unit will not operate unless installed correctly in this way and the possibility of damage to
the unit cannot be excluded.
1.4

Mounting Orientation

If the display has to be changed to a new position, it is possible to turn it relative to the
housing. To do this, remove the front and back of the housing and remove the screw retaining
the electronic board to the housing. Rotate the electronic board to the new desired position
taking care not to damage the cable link, refit and secure the retaining screws. In a similar
way, the window on the front of the access cover can also be turned.
2.

MOUNTING AT THE TUBE

2.1

Items with THREAD CONNECTION

We recommend sealing all threads with PTFE sealing tape. Ensure no excess of tape is left
protruding into the pipe.
When screwing the unit into a pipe, take care to ensure that the housing is not damaged or
impacted during the process.
2.2

Items with FLANGE CONNECTION

An approved flange seal or gasket must be used. Neither this nor the required fixing bolts are
included in the delivery. Ensure the transmitter is not damaged when tightening the flange
bolts.
©2013 Schmidt Mess- und Regeltechnik
Fon 0 67 32 - 91 91 20 Fax 0 67 32 - 96 24 42 info@schmidt-messtechnik.de
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